diff --git a/Sources/AnyPromise.h b/Sources/AnyPromise.h
index 75352d55c..34b5252d4 100644
--- a/Sources/AnyPromise.h
+++ b/Sources/AnyPromise.h
@@ -182,6 +182,13 @@ typedef void (^PMKResolver)(id __nullable) NS_REFINED_FOR_SWIFT;
  */
 - (AnyPromise * __nonnull(^ __nonnull)(dispatch_queue_t __nonnull, dispatch_block_t __nonnull))ensureOn NS_REFINED_FOR_SWIFT;
 
+/**
+ The provided block is executed on the global background queue when the receiver is resolved.
+
+ @see ensure
+ */
+- (AnyPromise * __nonnull(^ __nonnull)(dispatch_block_t __nonnull))ensureInBackground NS_REFINED_FOR_SWIFT;
+
 /**
  Wait until the promise is resolved.
 
diff --git a/Sources/AnyPromise.m b/Sources/AnyPromise.m
index 3725beacd..5b2626242 100644
--- a/Sources/AnyPromise.m
+++ b/Sources/AnyPromise.m
@@ -112,6 +112,12 @@ - (id)__d {
     };
 }
 
+- (AnyPromise *(^)(dispatch_block_t))ensureInBackground {
+    return ^(dispatch_block_t block) {
+        return [self->d __ensureOn:dispatch_get_global_queue(QOS_CLASS_UNSPECIFIED, 0) execute:block];
+    };
+}
+
 - (id)wait {
     return [d __wait];
 }
diff --git a/Sources/after.m b/Sources/after.m
index 25f9966fc..d98fb381b 100644
--- a/Sources/after.m
+++ b/Sources/after.m
@@ -7,7 +7,7 @@
 AnyPromise *PMKAfter(NSTimeInterval duration) {
     return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
         dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(duration * NSEC_PER_SEC));
-        dispatch_after(time, dispatch_get_global_queue(0, 0), ^{
+        dispatch_after(time, dispatch_get_global_queue(QOS_CLASS_UNSPECIFIED, 0), ^{
             resolve(@(duration));
         });
     }];
diff --git a/Sources/dispatch_promise.m b/Sources/dispatch_promise.m
index ecb89f711..f4f10e38c 100644
--- a/Sources/dispatch_promise.m
+++ b/Sources/dispatch_promise.m
@@ -6,5 +6,5 @@
 }
 
 AnyPromise *dispatch_promise(id block) {
-    return dispatch_promise_on(dispatch_get_global_queue(0, 0), block);
+    return dispatch_promise_on(dispatch_get_global_queue(QOS_CLASS_UNSPECIFIED, 0), block);
 }
diff --git a/Tests/CoreObjC/AnyPromiseTests.m b/Tests/CoreObjC/AnyPromiseTests.m
index d0726cf78..d2498b496 100644
--- a/Tests/CoreObjC/AnyPromiseTests.m
+++ b/Tests/CoreObjC/AnyPromiseTests.m
@@ -23,7 +23,7 @@
 
 static inline AnyPromise *fulfillLater() {
     return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
-        dispatch_async(dispatch_get_global_queue(0, 0), ^{
+        dispatch_async(dispatch_get_global_queue(QOS_CLASS_UNSPECIFIED, 0), ^{
             resolve(@1);
         });
     }];
@@ -797,7 +797,13 @@ - (void)testInBackground {
 
 - (void)testEnsureOn {
     id ex = [self expectationWithDescription:@""];
-    PMKAfter(0.1).ensureOn(dispatch_get_global_queue(0, 0), ^{ [ex fulfill]; });
+    PMKAfter(0.1).ensureOn(dispatch_get_global_queue(QOS_CLASS_UNSPECIFIED, 0), ^{ [ex fulfill]; });
+    [self waitForExpectationsWithTimeout:1 handler:nil];
+}
+
+- (void)testEnsureInBackground {
+    id ex = [self expectationWithDescription:@""];
+    PMKAfter(0.1).ensureInBackground(^{ [ex fulfill]; });
     [self waitForExpectationsWithTimeout:1 handler:nil];
 }